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View article: CTF Validation and Verification: Version 4.4
CTF Validation and Verification: Version 4.4 Open
Coolant-Boiling in Rod Arrays- Two Fluids (COBRA-TF) is a thermal/hydraulic (T/H) simulation code designed for light water reactor (LWR) analysis. It uses a two-fluid, three-field (i.e., fluid film, fluid drops, and vapor) modeling approac…
View article: Thermal Modeling of Hypersonic Wind Tunnel Heater using Low Fidelity Fluid Model
Thermal Modeling of Hypersonic Wind Tunnel Heater using Low Fidelity Fluid Model Open
Computational heat transfer analysis has been performed on the in-line flow heater contained within Sandia National Laboratories' Hypersonic Wind Tunnel to determine if the heater's materials potentially reach thermal limits during operati…
View article: CTF Validation and Verification: Version 4.3
CTF Validation and Verification: Version 4.3 Open
Coolant-Boiling in Rod Arrays- Two Fluids (COBRA-TF) is a thermal/hydraulic (T/H) simulation code designed for light water reactor (LWR) analysis. It uses a two-fluid, three-field (i.e., fluid film, fluid drops, and vapor) modeling approac…
View article: CTF Theory Manual: Version 4.3
CTF Theory Manual: Version 4.3 Open
Coolant-Boiling in Rod Arrays—Two Fluids (COBRA-TF) is a thermal/hydraulic (T/H) simulation code designed for light water reactor (LWR) vessel analysis. It uses a two-fluid, three-field (i.e., fluid film, fluid drops, and vapor) modeling a…
View article: Verification of MOOSE/Bison's Heat Conduction Solver Using Combined Spatiotemporal Convergence Analysis
Verification of MOOSE/Bison's Heat Conduction Solver Using Combined Spatiotemporal Convergence Analysis Open
Bison is a computational physics code that uses the finite element method to model the thermo-mechanical response of nuclear fuel. Since Bison is used to inform high-consequence decisions, it is important that its computational results are…
View article: Preliminary Implementation of Two-Dimensional Cartesian Solver in CTF-R
Preliminary Implementation of Two-Dimensional Cartesian Solver in CTF-R Open
Sub-channel codes are one of the the modeling and simulation tools used for thermal-hydraulic analysis of nuclear reactors. A few examples of such sub-channel codes are the COolant Boiling in Rod Arrays (COBRA) family of codes. The approxi…
View article: FY21 Status Report: Probabilistic SCC Model for SNF Dry Storage Canisters
FY21 Status Report: Probabilistic SCC Model for SNF Dry Storage Canisters Open
Stress corrosion cracking (SCC) is an important failure degradation mechanism for storage of spent nuclear fuel. Since 2014, Sandia National Laboratories has been developing a probabilistic methodology for predicting SCC. The model is inte…
View article: Validation Metrics for Fixed Effects and Mixed-Effects Calibration
Validation Metrics for Fixed Effects and Mixed-Effects Calibration Open
The modern scientific process often involves the development of a predictive computational model. To improve its accuracy, a computational model can be calibrated to a set of experimental data. A variety of validation metrics can be used t…
View article: Construction of a Code Verification Matrix for Heat Conduction With Finite Element Code Applications
Construction of a Code Verification Matrix for Heat Conduction With Finite Element Code Applications Open
When establishing the pedigree of a simulation tool, code verification is used to ensure that the implemented numerical algorithm is a faithful representation of its underlying mathematical model. During this process, numerical results on …
View article: Verification: a physics-based procedure with applications to CTF and BISON.
Verification: a physics-based procedure with applications to CTF and BISON. Open
power ramps. Results indicate a tendency to overpredict clad diameter reduction early in life, when clad creepdown dominates, and more significantly overpredict the diameter increase late in life, when fuel expansion controls the mechanica…
View article: Subcooled Boiling Models in CTF: Analysis and Separate Effects Validation.
Subcooled Boiling Models in CTF: Analysis and Separate Effects Validation. Open
Analysis (MAMBA). As part of its M&S efforts, CASL has identified various challenge problems, including Crud Induced Power Shift (CIPS), Crud-Induced Localized Corrosion (CILC), Pellet-Cladding Interaction (PCI), and Departure from Nucleat…
View article: CTF Theory Manual (V.4.2)
CTF Theory Manual (V.4.2) Open
Coolant-Boiling in Rod Arrays—Two Fluids (COBRA-TF) is a thermal/hydraulic (T/H) simulation code designed for light water reactor (LWR) vessel analysis. It uses a two-fluid, three-field (i.e. fluid film, fluid drops, and vapor) modeling ap…
View article: CTF User's Manual (V.4.2)
CTF User's Manual (V.4.2) Open
This document describes how a user should go about using the CTF pre-processor tool to create an input deck for modeling rod-bundle geometry in CTF. The tool was designed to generate input decks in a quick and less error-prone manner for C…
View article: CTF Validation and Verification (V.4.2)
CTF Validation and Verification (V.4.2) Open
Coolant-Boiling in Rod Arrays- Two Fluids (COBRA-TF) is a thermal/hydraulic (T/H) simulation code designed for Light Water Reactor (LWR) analysis. It uses a two-fluid, three-field (i.e. fluid film, fluid drops, and vapor) modeling approach…
View article: Separate Effects Validation for Subcooled Boiling in CTF
Separate Effects Validation for Subcooled Boiling in CTF Open
In 2010, the U.S. Department of Energy created its first Energy Innovation Hub, which is focused on developing high-fidelity and high-resolution modeling and simulation (M&S) tools for modeling of light water reactors (LWRs). This hub, the…
View article: FY20 Verification of BISON Using Analytic and Manufactured Solutions
FY20 Verification of BISON Using Analytic and Manufactured Solutions Open
In 2010, the U.S. Department of Energy created its first Energy Innovation Hub, which is focused on developing high-fidelity and high-resolution Modeling and Simulation (M&S) tools for modeling of Light Water Reactors (LWRs). This hub, Con…
View article: Improvements to CTF Code Verification and Unit Testing (FY2020)
Improvements to CTF Code Verification and Unit Testing (FY2020) Open
In 2010, the U.S. Department of Energy created its first Energy Innovation Hub, which focuses on improving Light Water Reactors (LWRs) through Modeling and Simulation. This hub, named the Consortium for the Advanced Simulation of LWRs (CAS…
View article: CTF 4.0 Theory Manual
CTF 4.0 Theory Manual Open
Coolant-Boiling in Rod Arrays - Two Fluids (COBRA-TF) is a thermal/hydraulic (T/H) simulation code designed for light water reactor (LWR) vessel analysis. It uses a two-fluid, three-field (i.e., fluid film, fluid drops, and vapor) modeling…
View article: CTF 4.0 Validation and Verification
CTF 4.0 Validation and Verification Open
Coolant-Boiling in Rod Arrays- Two Fluids (COBRA-TF) is a Thermal/Hydraulic (T/H) simulation code designed for Light Water Reactor (LWR) analysis. It uses a two-fluid, three-field (i.e. fluid film, fluid drops, and vapor) modeling approach…
View article: CTF 4.0 User's Manual
CTF 4.0 User's Manual Open
The deck version is specified using the PPV flag on Card 1.1. In general, you should always use the latest version of the CTF input deck in order to make sure your model is treated correctly in CTF. This feature was added to retain backwar…